I am having difficulty figuring out which datatypes to use for return values in a particular DLL import function (C#). I am trying to use the CryptGetKeyParam function from the ADVAPI32.dll API call to return certificate information. I am able to successfully call CryptAquireContext, and C...more >>

I have created dll with 2 simple functions written in C++ (Visual Studio ..NET) BOOL APIENTRY DllMain( HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved ) { return TRUE; } HHOOK hHOOK; /..../ __declspec(dllexport) void __cdecl MyAPP2SetHook(HINSTANCE hMod, int dwThreadI...more >>

It has arisen that I need to be able to talk from my application (C#) to another application (unmanaged C++) that runs in a different thread, and vice versa. I have tried the COM interop, but I keep getting new copies of the class instantiated, instead of talking to the one alreay running. I...more >>

Hi, I'm hoping someone can help here. In C++, if you create a com object in a thread running as an STA, & then want to use it on another thread running either as an STA or MTA, then the interface needs to be explicitly marshalled using, for example CoMarshalInterThreadInterfaceInStream. Now,...more >>

I am encoutering a problem when attempting to create Licensed Active X (VB) controls dynamically. I get a 747 "No design time license information found..." error. I have read the KB arcticles on using Licensed Active X controls in c# interop scenarios, but our situation is a bit different. ...more >>

If you have something like this: Byte myArray[] = new Byte[someSize]; And you pass that to a Win32 function using P/Invoke, is it possible to then cast that array to the "real" unmanged type that is contained within that Byte array? E.g. if you wanted to cast that array to an array of P...more >>

Hi I have a windows forms user control that is hosted in IE. This control uses COM Interop to access some RTC related interfaces. The control does not display itself correctly because of this COM reference. IF I remove all references to the tlbimp'ed COM dll, the control displays just fine...more >>

Guys, please help. I am trying to make this work from at least 4 months. I am new to programming and some things are difficult to me, but I really need to make my project work. I can't find anything helpfull in internet for 4 months ;-( . Please someone who is more expirenced help me. I am t...more >>

Hi, I have the following situation: In one folder on the harddisk i have a lot off vb stuff, i.e. C:\VBProg In this folder there are several dll and exe files, all vb6. I also have on the same harddisk a lot off dotnet stuff, in C:\DotNetProg In this folder also several dll and exe files,...more >>

I am makeing an app which uses WTS API function. I have done most of it, except a little part where I should marshal a structure from pointer. I have found some code in newsgroups, but it is in C# and I use VB .NET. I've tried to convert it by my own, but it gives me some errors in IDE. ...more >>

Hello Mattias, Happy New Year! I am trying to use GetHdevmode/SetHdevmode to set public and private portions of DEVMODE structure. Can you give me any hint, post an example in C# that shows how to change printer settings?? Million thanks in advance. heino ...more >>

We have developed a multiple user client/server application using .NET Framework 1.0 SP2. Recently we added the usage of the Clipboard and having some troubles on the target system. The users work with Remote Desktop from Windows 98 on a Server 2003 system. If a domain user started the...more >>

Hello I am trying to port a C stucture with union 's inside to VB.NET. I know there is no UNION keyword in VB.NEt, but how can i solve this in VB.NEt ? kind regards Dieter De Preester ...more >>

Hello! I've made a simple .NET .dll assembly which I deployed to another computer through a Setup-project (.msi-file). I opened Visual Studio Basic 6.0 and referenced the assembly. When I run the program it gives me: "Runtime Error 429 ActiveX Component can't Create Object". Doesn't the set...more >>

I would like to know if anyone can suggest how to implement the following: We need to have classes who's properties are defined by a database. The properties can not be hard coded. In addition properties datatype will also be defined by the database and are subject to change in the future. So...more >>

Simple question on memory allocation. I have a "Unmanaged" Client DLL that I'm creating a Managed wrapper to be used in Visual Basic .Net and C#.. Current in on the client side of the application, There are points where I need to allocate a "client side" memory buffer to marshall data into f...more >>

Hello all What would be the analogous c++ statement for this C# code ComInterface ci = (ComInterfaceClass)Marshal.CreateWrapperOfType( GenericType, typeof(ComInterfaceClass)); or (ItemClass) Marshal.CreateWrapperOfType( myObj, typeof(ItemClass) I tried Marshal::CreateWrapperOfType(myO...more >>

Hello, I have a native, C++ console app that uses ~26MB of RAM when it runs. It uses quite a lot of RAM to make some math but will never xceed 26MB. Now I've made a dll out of this code and use it with DllImport in a C# console application. Basically I just access main() and pass my parame...more >>

Ok, I'm at my wit's end. I've got IHTMLDocumentXXX working and everything directly from mshtml.dll in the system32 and even (with help from guys in here thanks!) the Element Collections working right. But I can't get my IHTMLElement implimentation to work. I get errors on a whole bunch of them...more >>

As I understood, when returning System.String with interop, .NET tries to delete it with CoTaskMemFree(). But, this char* points to permanent part of memory, and should not be deleted. Is it possible to disable this behaviour (with some marshal attribute maybe)? I know I can return IntPtr, but I...more >>

Hi, I have got a problem with the webbrowser control - IE Version 6.0.3790.0. You only have this version on Win2003 Server (all service packs installed) The progam runs perfect with the "normal" IE Version 6.0.2900.2180 onto WinXP, Win2000 -and- Win98/Me ;-) Intension: Use webbrowser ...more >>

Hi, I have an application that reads some data from an Excel file and= uses the Excel ActiveX object to do this=2E I have written a= function that opens the document and reads a value out=2E This= function works fine in when called from a console application=2E= However, running in an asp...more >>

Hi, I am new to vb=2Enet and am try to migrate a screensaver= application written in vb to vb=2Enet=2E To capture the key board= and mouse movements across the screen, i have a hook dll written= in vc++=2E I have a windows call back procedure which used to= process the key board and mouse...more >>

I'm trying to implement calls to an existing C-based DLL within a C# program. It sounds straightforward enough, but any calls to the extern functions produce a NullReferenceException. My code looks like this: [DllImport( @"e:\jbhexe\sscam.dll", EntryPoint="BAM_calcs" )] public static extern ...more >>

>From a class that extends windows form the following works. However, from a class object I receive "System.NullReferenceException" "Additional Information: Object reference not set to an instance of an object." // C# [DllImport("assvcapi.dll", EntryPoint="ASSVC_FetchChildFolders", CharSet...more >>

According to the article http://msdn.microsoft.com/library/default.asp?url=/library/en-us/odc_vsto2003_ta/html/VSTOFAQ.asp it is a known problem that certain events cannot be cancelled programatically when using the Excel PIA. Does anyone know if this is going to be fixed? Does anyone know a ...more >>

I am trying to call into a C DLL (fglove.dll) using C#. I would like to call the fdOpen and fdClose methods. I have included some of the header file. I am really new to this, so any help would be great. typedef struct { // The contents of this struct are platform-dependent and subject to...more >>

Hello List, I have a c library that has the following signature: If I have a C function that takes a 'const char* identifierString' as a parameter, would the following be the correct way to handle this? [DllImport(DLL_DIRECTORY_PATH)] public static extern void MyExternalFunction(IntPtr i...more >>

I'm trying to control the properties on a StreamBufferSource filter which is part of and graph. The filter is there and the graph also works(it renders the contents from the streambuffersink). The filter is an COM object and it should conform to an interface which looks like this in it original ...more >>

Greetings to all, I have developed a Web service in which I have to access the active directory, in order to retrieve all the groups in a domain, and also a list of all the users in a group. I am using WinNT and not LDAP, and I am using windows authentiaction and impersonation. In order to ...more >>

I used the LoadTypeLibEx to open a COM type lib. This returns a UCOMITypeLib interface, which when coupled with the Marshaller namespace can get you lots of info. My problem is that I don't know what to use to get the version of the type lib. Is it buried in the LibAttr structure? Or is ...more >>

I have a very custom case where a typelib relies on another typelib that does not have a PIA. We want to make our interop for our typelib a PIA. We cannot change our typelib at all (interfaces are cemented), so the decision was to modify the interop assembly created from our type lib to manu...more >>

I need to call the following C method from a C# application. char* GetKeyValue(char* name) I'm sure this is a common question and there should be some docs on it somewhere, can anyone point me to them. Thanks, Tony ...more >>

I was wondering if anyone knows how to get the DllImport library name for a method? I'd like to use reflection on an existing assembly to get the library name for a method if it is a PInvokeImpl method. Thanks in advance, Jim ...more >>

hello, I'm using the SHDocVw.WebBrowserClass. I'm trying to get the System.Windows.Forms.Form of the explorer window out of it. how can i do this? thanx, amir...more >>

I know that this is supposed to be simple, but I just can't get it to work--I've been at it for several days!!! Here's my simple c++ class: // sayHello.h #include <string> using namespace std; class sayHello { string sComment; public: sayHello(string sCmnt); ~sayHello(); void S...more >>

I am working in VC++ .Net 2003. I am building a managed project that uses a 3rd party API. I am using DllImport to tell my project about the API. But I'm getting error LNK2001: unresolved external symbol "unsigned int __cdecl ClientAPIrxLen(void)" (?ClientAPIrxLen@@YAIXZ) Where do I nee...more >>

I'm posting here because there's not a newsgroup about reflection and my issue is about a COM application: Outlook 2003. I'm using the following code (I'm referring Outlook and using Reflection in VS2003): Type otype = Type.GetTypeFromProgID("Outlook.Application",true); object outlook = A...more >>

Can someone please tell me how to marshall the following? enum { LIFFE_SIZE_AUTOMARKETREF = 15 }; typedef char LiffeAutoMarketReference [LIFFE_SIZE_AUTOMARKETREF]; typedef struct _tagLiffeSettlementList { struct _tagLiffeSettlementList* pcNext; LiffeAutoMarketRefere...more >>

Bonjour, je fais actuellement un développement c# avec VS studio .net 2003 avec le framework .net 1.1. Celui-ci interface Wininet.dll afin d'établir une connection ftp. J'envoie une ftpCommand "LIST", j'ouvre le handle renvoyé avec InternetReadFile, je récupère ainsi les noms des fichier à té...more >>

Hello, How do I get a C# file to call a managed C++ class method whose argument is a reference to a basic type? I get a C# compile time error message saying that it can't convert a reference to a pointer. The C++ assembly shows the parameter as a pointer. Why does it do that? Thanks // C++ f...more >>

I am trying to subscribe to C++ Sink Event in C#, here is how we did it = in C++. ..h CComPtr<IPEvents> m_pPortEvent; DWORD m_eventNotifierCookie, m_ServerNotifierCookie; DECLARE_DISPATCH_MAP() DECLARE_INTERFACE_MAP()=20 ..cpp class() BEGIN_DISPATCH_MAP( CClass, CWnd) DIS...more >>

I need to marshal as string array in C# to an IntPtr. Ist there any way to do this. for instance. string[] str = { "this", "should", "have", "a", "pointer" }; IntPtr ptr = Marshal.AllocHGlobal(Marhsal.SizeOf(str.Length * str.Length); Marshal.StructureToPtr(str,ptr,false); Thanks in Advan...more >>

I am developing an addin for Word in C#. In order to support both Word 2000 & 2003, I had copied the appropriate Word 9.0 libraries (mso9.dll and msword9.olb) to my development machine, which has Office 2003 installed on it. Everything was great; I referenced the Word 11.0 libraries for the ...more >>

We just released the beta of version 7 of our VB6 based app. We have documented how to write a VB.Net addin to extend our functionality and it works just fine using the version 6 release. One of our beta sites who has written and is selling a .Net addin for the v6 tried to make his very s...more >>

I have a problem - if I've directed this to the wrong newsgroup, then I send 1000 apologies in advance. I have developed a database front-end using VS2002, on my own PC, which currently has Office 2003 Pro installed on it. Part of my front-end app uses Excel as the reporting output. When ...more >>

I am working on converting my COM DLL from an inprocserver32 to a localserver32. I am looking at the article referenced here: http://blogs.msdn.com/adioltean/archive/2004/06/18/159479.aspx I am trying to put the C# code for the service, installer, etc into my DLL code.. and for some reaso...more >>

I'm trying to get some properties from a COM object. I built WindowsInstaller.dll by means of tlbimp.exe above msi.dll (Windows Installer objects), then I added a reference to it in VS.NET 2003. I succeeded with reading some objects reference using Reflection and InvokeMember method. I used th...more >>

I have a VB6 application that calls a .NET class in C#. I compiled the ..NET class with COM Interop set to true (output to a .tlb file), and I can run the app and call the .NET class no problem. However, I am having trouble disposing of the .NET class when I am done with it. I created a publ...more >>

All, I am needing to programatically (.NET) open a Terminal Server 2003 session, execute a program and close the session. Sounds easy enough. Well, I've gOOgled my brains out and I've found myself right back where I started, with nothing. Does anyone have some detailed examples on how t...more >>